A loading unit and retention band assembly including a shell and a retentionband.The shell has a proximal end portion that defines an engagement window andthat includes anannular surface. The retention band is disposed radially about the annularsurface of theproximal end portion and includes a resilient body having first and secondends. The firstend includes a resilient lock that is configured to extend through theengagement window ofthe proximal end portion of the shell. The resilient lock is dimensioned toreleasably engagea surgical instrument.
